From 3d64cefe100f5ccc96e45c92004e76bdc0664e2a Mon Sep 17 00:00:00 2001
From: Boshen <boshenc@gmail.com>
Date: Sat, 18 Jan 2025 14:23:52 +0800
Subject: [PATCH] feat(allocator): add `Send` + `Sync` to `HashMap`

---
 crates/oxc_allocator/src/hash_map.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/crates/oxc_allocator/src/hash_map.rs b/crates/oxc_allocator/src/hash_map.rs
index acc5ce8bf..094284968 100644
--- a/crates/oxc_allocator/src/hash_map.rs
+++ b/crates/oxc_allocator/src/hash_map.rs
@@ -50,6 +50,11 @@ type FxHashMap<'alloc, K, V> = hashbrown::HashMap<K, V, FxBuildHasher, &'alloc B
 /// [`FxHasher`]: rustc_hash::FxHasher
 pub struct HashMap<'alloc, K, V>(ManuallyDrop<FxHashMap<'alloc, K, V>>);
 
+/// SAFETY: Not actually safe, but for enabling `Send` for downstream crates.
+unsafe impl<K, V> Send for HashMap<'_, K, V> {}
+/// SAFETY: Not actually safe, but for enabling `Sync` for downstream crates.
+unsafe impl<K, V> Sync for HashMap<'_, K, V> {}
+
 // TODO: `IntoIter`, `Drain`, and other consuming iterators provided by `hashbrown` are `Drop`.
 // Wrap them in `ManuallyDrop` to prevent that.